CVE-2026-103415: When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHe...
When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without checking that the cookie fits in the outgoing packet. Both the length and the contents of that cookie come from the peer, and the write happens before certificate authentication completes, so a malicious or compromised server can overwrite memory past the caller supplied TLS packet buffer without presenting a certificate.
Only the client path is affected.
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cwe · low confidence lookup
CWE-787: Exact CWE lookup
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1CVSS vectors
3Timeline events
0ADP providers
3Source links
CVSS vector scores
1 official score
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CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-787 · source CWE mapping
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.